Direct Chosen-Ciphertext Secure Attribute-Based Key Encapsulations without Random Oracles

J. Blömer, G. Liske, (2013).

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We present a new technique to realize attribute-based encryption (ABE) schemes secure in the standard model against chosen-ciphertext attacks (CCA-secure). Our approach is to extend certain concrete chosen-plaintext secure (CPA-secure) ABE schemes to achieve more efficient constructions than the known generic constructions of CCA-secure ABE schemes. We restrict ourselves to the construction of attribute-based key encapsulation mechanisms (KEMs) and present two concrete CCA-secure schemes: a key-policy attribute-based KEM that is based on Goyal's key-policy ABE and a ciphertext-policy attribute-based KEM that is based on Waters' ciphertext-policy ABE. To achieve our goals, we use an appropriate hash function and need to extend the public parameters and the ciphertexts of the underlying CPA-secure encryption schemes only by a single group element. Moreover, we use the same hardness assumptions as the underlying CPA-secure encryption schemes.
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Blömer J, Liske G. Direct Chosen-Ciphertext Secure Attribute-Based Key Encapsulations without Random Oracles. 2013.
Blömer, J., & Liske, G. (2013). Direct Chosen-Ciphertext Secure Attribute-Based Key Encapsulations without Random Oracles. Universität Paderborn.
@article{Blömer_Liske_2013, title={Direct Chosen-Ciphertext Secure Attribute-Based Key Encapsulations without Random Oracles}, publisher={Universität Paderborn}, author={Blömer, Johannes and Liske, Gennadij}, year={2013} }
Blömer, Johannes, and Gennadij Liske. “Direct Chosen-Ciphertext Secure Attribute-Based Key Encapsulations without Random Oracles.” Universität Paderborn, 2013.
J. Blömer and G. Liske, “Direct Chosen-Ciphertext Secure Attribute-Based Key Encapsulations without Random Oracles.” Universität Paderborn, 2013.
Blömer, Johannes, and Gennadij Liske. Direct Chosen-Ciphertext Secure Attribute-Based Key Encapsulations without Random Oracles. Universität Paderborn, 2013.
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